spiegel-keyman/web/source/utils/deepCopy.ts

namespace com.keyman.utils {
  /**
   * Function     deepCopy
   * Scope        Private
   * @param       {Object}      p           object to copy
   * @param       {Array=}      c0          array member being copied
   * @return      {Object}                  clone ('deep copy') of object
   * Description  Makes an actual copy (not a reference) of an object, copying simple members,
   *              arrays and member objects but not functions, so use with care!
   */
  export function deepCopy<T>(p:T, c0?): T {
    var c = c0 || {};
    for (var i in p) {
      if(typeof p[i] === 'object' && p[i] != null) {
        c[i] = (p[i].constructor === Array ) ? [] : {};
        deepCopy(p[i],c[i]);
      }
      else {
        c[i] = p[i];
      }
    }

    return c;
  }
}